Combining Control by CTA and Dynamic En Route Speed Adjustment to Improve Ground Delay Program Performance
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1 Combining Control by CTA and Dynamic En Route Speed Adjustment to Improve Ground Delay Program Performance James C. Jones, University of Maryland David J. Lovell, University of Maryland Michael O. Ball, University of Maryland 11 th FAA/EUROCONTROL ATM R&D Seminar Lisbon, Portugal June 23-26,
2 Overview Motivation and Background Proposed changes to GDP planning architecture New GDP planning integer programming models Results Summary 2
3 Motivating Ideas Control by CTA Klooster et al [2009], McDonald and Bronsvoort [2012], Nieuwenhuisen, and Gelder [2012], Delta (Atilla), United Airlines (Heathrow) Speed Control GDP planning: Delgado and Prats [2011], [2013], [2014], Prats and Hansen [2011], Jones [2014] Tactical planning: Neuman and Erzberger [1991], Knorr et al [2011], Swenson et al [2011], Jones et al [2013], ATD-1, Extended Metering Collaborative Decision Making Wambsganns [1993], Ball et al [2001], Vossen and Ball [2006], [2006], Fearing et al [2011] Hedging Under Uncertainty Capacity Uncertainty: Richetta and Odoni, [1993], Ball et al [2003], Mukherjee and Hansen [2007], Ball et al [2010] Demand Uncertainty: Ball et al [2001] 3
4 GDP Background When faced with inclement weather the capacity of airports is often insufficient to meet demand To deal with these imbalances FAA managers impose a Ground Delay Program (GDP) Since inclement weather will often clear prior to the end of the GDP an exemption radius is set Removes delays to long haul flights Can reduce overall delay if the weather clears earlier than expected 4
5 Speed Control in Ground Delay Programs During GDPs, flight managers assign a controlled time of departure (CTD) to flights Assigning Controlled Times of Arrival (CTAs) in lieu of CTDs may offer a more attractive means of transferring delay Provides carriers more flexibility and control Allows for system-wide trade-offs Delay allocation under conventional GDP Planning GD Travel Time STD CTD STA CTA 5
6 Speed Control in Ground Delay Programs During GDPs, flight managers assign a controlled time of departure (CTD) to flights Assigning Controlled Times of Arrival (CTAs) in lieu of CTDs may offer a more attractive means of transferring delay Provides carriers more flexibility and control Allows for system-wide trade-offs Delay allocation under CTA based GDP Planning GD min Variable Delay Travel Time STD CTD max STA CTA CTD min 6
7 Speed Control in Ground Delay Programs During GDPs, flight managers assign a controlled time of departure (CTD) to flights Assigning Controlled Times of Arrival (CTAs) in lieu of CTDs may offer a more attractive means of transferring delay Provides carriers more flexibility and control Allows for system-wide trade-offs Delay allocation under CTA based GDP Planning FAA Airlines GD min Variable Delay Travel Time STD CTD max STA CTA CTD min 7
8 Speed Control in Ground Delay Programs During GDPs, flight managers assign a controlled time of departure (CTD) to flights Assigning Controlled Times of Arrival (CTAs) in lieu of CTDs may offer a more attractive means of transferring delay Provides carriers more flexibility and control Allows for system-wide trade-offs GDP Planning Process 8
9 Current Practice: RBS with Exemptions Flights are assigned to available slots based on the order they appear in the schedule Exempt flights receive priority 9
10 Shortcomings of Exemptions Cancellation and Substitution process in current CDM framework. DAL490 and UA12 cannot make substitutions since exempt flights are airborne Can add additional delay to flights or cause additional cancellations 10
11 Advantage of Adding Speed Control With speed control Delta and United can reassign airborne flights and achieve better metrics Cancellation and Substitution process without exemptions. Delta and United can substitute and improve their on-time performance. 11
12 Fuel Usage Characteristics Fuel efficiency is a concave function of speed Specific Range NM/ton Maximum Range General Characteristics: Cost curves are relatively flat Cruise speeds can often exceed the maximum range Slowing down during cruise can increase specific range Range of Operation Airlines could adjust speeds of flights to reduce ground delays during GDPs at a relatively small fuel penalty v min v max Mach Number 12
13 New GDP Architecture FAA procedural modifications Replace the use of CTDs with CTAs in GDP planning Remove the exemption radius Allow en route speed changes by carriers Airline decision making modifications Incorporate speed changes into substitution and cancellation process Introduce a new stochastic optimization model to support airline decision-making with substitutions and cancellations Model matches flights to assigned capacity Allows airlines to hedge for early weather clearance 13
14 Conventional GDP Planning Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS DB- RBS FAA Assign CTDs to Airlines Airlines Substitute A A and Cancel Flights FAA Compression Data Algorithms Allocations Airline Decisions 14
15 Conventional GDP Planning Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS DB- RBS FAA Assign CTDs to Airlines Airlines Substitute A A and Cancel Flights FAA Compression Data Algorithms Allocations Airline Decisions Mechanisms Departure Time Changes Flight Cancellations 15
16 Conventional GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS DB- RBS Assign CTDs to Airlines Substitute A A and Cancel Flights Compression Data Algorithms Departure Time Changes Allocations Airline Decisions Mechanisms 16
17 Conventional GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS DB- RBS Assign CTDs to Airlines Substitute A A and Cancel Flights Compression Data Algorithms Allocations Airline Decisions System has limited measures for recourse in the presence of unplanned conditions Slow to react in the presence of early clearance of weather Cannot take full advantage of opportunities for potential trades 17
18 CTA Based GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS RBS Assign CTAs to Airlines Substitute A A and Cancel Flights + + Compression Data Algorithms Allocations Airline Decisions 18
19 CTA Based GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS RBS Assign CTAs to Airlines Substitute A A and Cancel Flights + + Compression Data Algorithms Allocations Airline Decisions 19
20 CTA Based GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS RBS Assign CTAs to Airlines Substitute A A and Cancel Flights + + Compression Data Algorithms Hedging Departure Time Changes Flight Cancellations Speed Control Allocations Airline Decisions Mechanisms 20
21 CTA Based GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS RBS Assign CTAs to Airlines Substitute A A and Cancel Flights + + Compression Data Algorithms Allocations Airline Decisions Mechanisms Speed Control Departure Time Changes 21
22 CTA Based GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS RBS Assign CTAs to Airlines Substitute A A and Cancel Flights + + Compression Data Algorithms Allocations Airline Decisions System is more flexible in accommodating unplanned conditions More effective delay in the presence of early clearance of weather Allows additional substitution opportunities Adjustments can be performed to react to both major and minor perturbations 22
23 CTA Based GDP Planning FAA Airlines FAA Airborne Flights: Flight Positions and ETAs, AC speeds Flight on Ground: Flight Schedule FCFS RBS Assign CTAs to Airlines Substitute A A and Cancel Flights + + Compression Model 1 Model 2 Data Algorithms Allocations Airline Decisions Model 1: Airline Substitution and Cancellation Model Hedging Incorporates Speed Control into Decisions Model 2: FAA Compression Model Adds speed control to current compression framework 23
24 Evolution of a GDP GDP Activity t start t c1 t c2 t c3 t c4 t end GDP Timeline GDP Capacity C standard C GDP Goal: We want to account for the possibility of early clearance when assigning flights. t start t c1 t c2 t c3 t c4 t end GDP Timeline 24
25 Evolution of a GDP GDP Activity t start Scenario Tree t c1 t c2 t c3 t c4 t end GDP Timeline t c1 t c2 t c3 t c4 t end Yes Yes Yes Yes Yes 25
26 Model 1: Airline Substitution and Cancellation Stage 1: Initial Assignment Arrival Time Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Slots Allocated with RBS DAL Other Airlines 26
27 Model 1: Airline Substitution and Cancellation Stage 1: Initial Assignment Arrival Time Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 DAL Other Airlines 27
28 Model 1: Airline Substitution and Cancellation Stage 1: Initial Assignment Arrival Time Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Cancelled Flights DAL Other Airlines 28
29 Model 1: Airline Substitution and Cancellation Stage 1: Initial Assignment Arrival Time Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Cancelled Flights DAL Other Airlines 29
30 Model 1: Airline Substitution and Cancellation Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 Stage 1: Initial Assignment Arrival Time S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Stage 2: Revised Assignment Cancelled Flights Arrival Time S1-5:08 S2-5:10 S3-5:12 S4-5:14 S22-5:42 Feasible Range without Holding Feasible Range with Holding DAL Other Airlines 30
31 Model 1: Airline Substitution and Cancellation Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 Stage 1: Initial Assignment Arrival Time S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Stage 2: Revised Assignment Arrival Time Arrival Time Arrival Time Arrival S1-5:08 Time S1-5:08 S1-5:08 S1-5:08 S2-5:10 S2-5:10 S2-5:10 S2-5:10 S3-5:12 S3-5:12 S3-5:12 S3-5:12 S4-5:14 S4-5:14 S4-5:14 S4-5:14 S22-5:42 S22-5:42 S22-5:42 S22-5:42 Incorporates Planning over Multiple Scenarios Cancelled Flights DAL Other Airlines 31
32 Model 1: Airline Substitution and Cancellation Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 Stage 1: Initial Assignment Arrival Time S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Stage 2: Revised Assignment Arrival Time Arrival Time Arrival Time Arrival S1-5:08 Time S1-5:08 S1-5:08 S1-5:08 S2-5:10 S2-5:10 S2-5:10 S2-5:10 S3-5:12 S3-5:12 S3-5:12 S3-5:12 S4-5:14 S4-5:14 S4-5:14 S4-5:14 S22-5:42 S22-5:42 S22-5:42 S22-5:42 Airlines can choose to remain in original slot if they expect no early weather clearance in scenario. Cancelled Flights DAL Other Airlines 32
33 Model 1: Airline Substitution and Cancellation Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 Stage 1: Initial Assignment Arrival Time S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Stage 2: Revised Assignment Arrival Time Arrival Time Arrival Time Arrival S1-5:08 Time S1-5:08 S1-5:08 S1-5:08 S2-5:10 S2-5:10 S2-5:10 S2-5:10 S3-5:12 S3-5:12 S3-5:12 S3-5:12 S4-5:14 S4-5:14 S4-5:14 S4-5:14 S22-5:42 S22-5:42 S22-5:42 S22-5:42 Airlines can also fly faster if they expect the weather to clear early in the scenario. Cancelled Flights DAL Other Airlines 33
34 Model 1: Airline Substitution and Cancellation Flight DAL53:5:03 DAL201:5:06 DAL142:5:10 Stage 1: Initial Assignment Arrival Time S1-5:10 S2-5:12 S3-5:14 S4-5:16 S6-5:20 Stage 2: Revised Assignment Arrival Time Arrival Time Arrival Time Arrival S1-5:08 Time S1-5:08 S1-5:08 S1-5:08 S2-5:10 S2-5:10 S2-5:10 S2-5:10 S3-5:12 S3-5:12 S3-5:12 S3-5:12 S4-5:14 S4-5:14 S4-5:14 S4-5:14 S22-5:42 S22-5:42 S22-5:42 S22-5:42 Objective: Each airline minimizes the total expected cost of assignments and cancellations over all scenarios. Cancelled Flights DAL Other Airlines 34
35 Model 2: Compression Flight Airport Flight Airport AA561-4:58 S1-5:00 AA561-4:58 S1-5:00 UA53-5:00 DAL12-5:03 S2-5:04 S3-5:06 Compression UA53-5:00 DAL12-5:03 S2-5:04 S3-5:06 UA183-5:05 S4-5:09 UA183-5:05 S4-5:09 DAL490-5:06 S5-5:12 DAL490-5:06 S5-5:12 AA321-5:11 S6-5:15 AA321-5:11 S6-5:15 RBS++ : Vossen and Ball [2006] with speed control 35
36 Impact of Changes on Airline Costs The proposed changes have potential to reduce airline costs Airlines can choose whether to prioritize cancellations or delay End result is fewer missed connections and/or better customer service Computational experiment was conducted to evaluate potential cost savings GDP cancellation probabilities and amount of ground delay recovered was taken from Inniss and Ball 1 Examined GDP cost savings under various early weather clearance scenarios 1 Inniss, T.R., Ball, M.O., Estimating one-parameter airport arrival capacity distributions for air traffic flow management. Air Traffic Control Quarterly 12,
37 Airline Cost Model Adopted cost model used by Vakili and Ball (ATM seminar 2009) Approach assumes block time is free during first 15 min, then $32 per min on the ground and $64 in the air We assume equal cost of ground and air delay of $40 after first 15 min Model also assumes airlines take delay cost of $0.1 per min Updating to 2013 airline costs reach $0.125 per min Parameters P: Number of passengers of aircraft x: Minutes of flight delay M p : The delay threshold beyond which it becomes cost effective to cancel the flight C( x, P) P x P M 15 0 p x x M x M p p 37
38 Experimental Test Conditions Data Source: TFMS and ASDX files Airport: ATL Date of Flights: May 1, hour GDP Aircraft speeds ranged from Mach Capacity reduced to 40 flights per hour Load Factor of 0.8 Flight cancellation costs equal delay costs at 120 min Exemption Radius of 1000 nm for Conventional GDPs 38
39 Cost ($) Cost Savings under Early Cancellation CTA assignment leads to significant cost savings when the weather clears sufficiently early Earlier departure times allow for greater delay recovery 350, , , , , , , >=5 Clearance Time Conventional Winter Spring Spring 39
40 Cost Savings under Early Cancellation CTA assignment leads to significant cost savings when the weather clears sufficiently early Earlier departure times allow for greater delay recovery Percentage Cost Savings Cancellation Hour Winter Spring Summer >=
41 Experimental Test Conditions Data Source: TFMS and ASDX files Airport: ATL Date of Flights: May 1, hour GDP Aircraft speeds ranged from Mach Capacity reduced to 40 flights per hour Load Factor of 0.8 Flight cancellation costs equal delay costs at 90 min Exemption Radius of 1000 nm for Conventional GDPs Uniform Probabilities for scenarios 40
42 Cancellations and Substitutions Assumed up to 60 minutes of early GDP clearance Proposed changes lead to fewer cancellations and more delay Percentage of Flights Cancelled Passenger Delay Number of Flights Airline Conventional CTA Based GDP Conventional CTA Based GDP Conventional GDP GDP GDP CTA Based GDP Delta (DAL) Air Tran (TRS) American Southeast (ASQ) American (AAL) Pinnacle (FLG)
43 Minutes of Delay Cancellations and Substitutions Assumed up to 30 minutes of early GDP clearance Proposed changes lead to fewer cancellations and more delay Percentage of Cancellations Minutes of Delay per Flight DAL TRS ASQ AAL FLG 0 DAL TRS ASQ AAL FLG Conventional CTA Based Conventional CTA Based 42
44 Minutes of Delay Effect of Exemption Radius Used integer programming models seeded from DB-RBS instead of RBS The addition of the exemption radius transfers delay from DAL and TRS to regional Airlines ASQ Percentage of Cancellations Minutes of Delay per Flight DAL TRS ASQ AAL FLG 0 DAL TRS ASQ AAL FLG With Radius Without Radius With Radius Without Radius 44
45 Impact of Early Cancellation Early cancellation is more helpful to dominant carriers with more long haul flights Minutes of Delay Recovered 45
46 Minutes of Delay per Flight Impact of Early Cancellation Early cancellation is more helpful to dominant carriers with more long haul flights Minutes of Delay Recovered per Flight DAL TRS ASQ AAL FLG
47 Summary and Future Work Proposed a new strategy for managing GDPs Control by CTA En Route Speed Control Eliminated Exemption Radius Strategy provides opportunities for significant cost savings Strategy may lead to airline behavioral changes Fewer cancellations More delay Near Term Challenges Compliance Modifying current procedures Long Term Challenges Need to reconcile flexibility with Trajectory Based Operations Managing flights with dynamic adjustment 47
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